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# Microsoft Azure Linux Agent
#
# Copyright 2018 Microsoft Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Requires Python 2.6+ and Openssl 1.0+
#
import base64
import errno
import struct
import os.path
import subprocess
from azurelinuxagent.common.future import ustr, bytebuffer
from azurelinuxagent.common.exception import CryptError
import azurelinuxagent.common.logger as logger
import azurelinuxagent.common.utils.shellutil as shellutil
DECRYPT_SECRET_CMD = "{0} cms -decrypt -inform DER -inkey {1} -in /dev/stdin"
class CryptUtil(object):
def __init__(self, openssl_cmd):
self.openssl_cmd = openssl_cmd
def gen_transport_cert(self, prv_file, crt_file):
"""
Create ssl certificate for https communication with endpoint server.
"""
cmd = [self.openssl_cmd, "req", "-x509", "-nodes", "-subj", "/CN=LinuxTransport",
"-days", "730", "-newkey", "rsa:2048", "-keyout", prv_file, "-out", crt_file]
try:
shellutil.run_command(cmd)
except shellutil.CommandError as cmd_err:
msg = "Failed to create {0} and {1} certificates.\n[stdout]\n{2}\n\n[stderr]\n{3}\n"\
.format(prv_file, crt_file, cmd_err.stdout, cmd_err.stderr)
logger.error(msg)
def get_pubkey_from_prv(self, file_name):
if not os.path.exists(file_name):
raise IOError(errno.ENOENT, "File not found", file_name)
# OpenSSL's pkey command may not be available on older versions so try 'rsa' first.
try:
command = [self.openssl_cmd, "rsa", "-in", file_name, "-pubout"]
return shellutil.run_command(command, log_error=False)
except shellutil.CommandError as error:
if not ("Not an RSA key" in error.stderr or "expecting an rsa key" in error.stderr):
logger.error(
"Command: [{0}], return code: [{1}], stdout: [{2}] stderr: [{3}]",
" ".join(command),
error.returncode,
error.stdout,
error.stderr)
raise
return shellutil.run_command([self.openssl_cmd, "pkey", "-in", file_name, "-pubout"], log_error=True)
def get_pubkey_from_crt(self, file_name):
if not os.path.exists(file_name):
raise IOError(errno.ENOENT, "File not found", file_name)
else:
cmd = [self.openssl_cmd, "x509", "-in", file_name, "-pubkey", "-noout"]
pub = shellutil.run_command(cmd, log_error=True)
return pub
def get_thumbprint_from_crt(self, file_name):
if not os.path.exists(file_name):
raise IOError(errno.ENOENT, "File not found", file_name)
else:
cmd = [self.openssl_cmd, "x509", "-in", file_name, "-fingerprint", "-noout"]
thumbprint = shellutil.run_command(cmd)
thumbprint = thumbprint.rstrip().split('=')[1].replace(':', '').upper()
return thumbprint
def decrypt_certificates_p7m(self, p7m_file, trans_prv_file, trans_cert_file, pfx_file):
umask = None
try:
umask = os.umask(0o077)
with open(pfx_file, "wb") as pfx_file_:
shellutil.run_command([self.openssl_cmd, "cms", "-decrypt", "-in", p7m_file, "-inkey", trans_prv_file, "-recip", trans_cert_file], stdout=pfx_file_)
finally:
if umask is not None:
os.umask(umask)
def convert_pfx_to_pem(self, pfx_file, nomacver, pem_file):
command = [self.openssl_cmd, "pkcs12", "-nodes", "-password", "pass:", "-in", pfx_file, "-out", pem_file]
if nomacver:
command.append("-nomacver")
shellutil.run_command(command)
def crt_to_ssh(self, input_file, output_file):
with open(output_file, "ab") as file_out:
cmd = ["ssh-keygen", "-i", "-m", "PKCS8", "-f", input_file]
try:
shellutil.run_command(cmd, stdout=file_out, log_error=True)
except shellutil.CommandError:
pass # nothing to do; the error is already logged
def asn1_to_ssh(self, pubkey):
lines = pubkey.split("\n")
lines = [x for x in lines if not x.startswith("----")]
base64_encoded = "".join(lines)
try:
#TODO remove pyasn1 dependency
from pyasn1.codec.der import decoder as der_decoder
der_encoded = base64.b64decode(base64_encoded)
der_encoded = der_decoder.decode(der_encoded)[0][1] # pylint: disable=unsubscriptable-object
key = der_decoder.decode(self.bits_to_bytes(der_encoded))[0]
n=key[0] # pylint: disable=unsubscriptable-object
e=key[1] # pylint: disable=unsubscriptable-object
keydata = bytearray()
keydata.extend(struct.pack('>I', len("ssh-rsa")))
keydata.extend(b"ssh-rsa")
keydata.extend(struct.pack('>I', len(self.num_to_bytes(e))))
keydata.extend(self.num_to_bytes(e))
keydata.extend(struct.pack('>I', len(self.num_to_bytes(n)) + 1))
keydata.extend(b"\0")
keydata.extend(self.num_to_bytes(n))
keydata_base64 = base64.b64encode(bytebuffer(keydata))
return ustr(b"ssh-rsa " + keydata_base64 + b"\n",
encoding='utf-8')
except ImportError:
raise CryptError("Failed to load pyasn1.codec.der")
def num_to_bytes(self, num):
"""
Pack number into bytes. Retun as string.
"""
result = bytearray()
while num:
result.append(num & 0xFF)
num >>= 8
result.reverse()
return result
def bits_to_bytes(self, bits):
"""
Convert an array contains bits, [0,1] to a byte array
"""
index = 7
byte_array = bytearray()
curr = 0
for bit in bits:
curr = curr | (bit << index)
index = index - 1
if index == -1:
byte_array.append(curr)
curr = 0
index = 7
return bytes(byte_array)
def decrypt_secret(self, encrypted_password, private_key):
try:
decoded = base64.b64decode(encrypted_password)
args = DECRYPT_SECRET_CMD.format(self.openssl_cmd, private_key).split(' ')
output = shellutil.run_command(args, input=decoded, stderr=subprocess.STDOUT, encode_input=False, encode_output=False)
return output.decode('utf-16')
except shellutil.CommandError as command_error:
raise subprocess.CalledProcessError(command_error.returncode, "openssl cms -decrypt", output=command_error.stdout)
except Exception as e:
raise CryptError("Error decoding secret", e)
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